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(No Model.) 2 Sheets-Sheet 1. P. PUTNAM.

SAWING MACHINE.

No. 447,903. Patented Mar. 10, 1891.

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No. 447,903. Patented Mar. 10, 1'89 m5 NBRRIS PETENS c0, Pmrnmnna,WAsHl-NUTDN, o. c.

UNITED STATES ATENTY OFFICE.

PERRY PUTNAM, OF LOIVELL, MASSACHUSETTS, ASSIGNOR TO CHARLES E. GEE, OFSAME PLACE.

SAWlNG-MACHINE.

SPECIFICATION forming part of Letters Patent NO. 447,903, dated March10, 1891.

Application filed September 27, 1889. Serial No. 325,332. (No model.)

To all whom, it may concern:

Be it known that I, PERRY PUTNAM, a citizen of the United States,residing at Lowell,

in the county of Middlesex and Commonwealth of Massachusetts, haveinvented a new and useful Improvement in Sawing-Machines, of which thefollowing is a specification.

My invention relates to machine saw benches in which one or morecircular saws 1o operate in conjunction with guide-rests and top surfaceof a fiat table or bench; and the objects of my invention are to providemeans for elevating and adjusting the saws, which may be set to insurethe possibility of the teeth of but one saw being above the surface ofthe table, and furnish machines with safer and more convenient mechanismthan that heretofore used.

In the accompanying drawings, Figure 1 is a front elevation of theentire machine. Fig. 2 is an isometric view of the device for thevertical adjustment of the saws. Fig. 3 is a sectional elevation of .theguide-rest used for gaging thicknesses of lumber to be cut by thesplitting-saw. Fig. etisaside elevation of the entire machine, a part ofthe basecasting being broken away. Fig. 5 is a detail of the hand-wheel,worm,and worm-gear. Figs. 6 and 7 are side elevations of the uppersprocketwheels, chain, and a part of the saw-arbor frames. Fig. 8 is aplan view of the lastnamed parts and a portion in section on line 8 8 ofthe frame-casting. Fig. 9 is a plan view, and Fig. 10 is a sectionalelevation, of

3 5 the cutting-off rest.

A is the table or bench upon which the material to be sawed is handled.

B is the frame-work, and C is the base-casting supporting the table.

D and D are saw-arbor frames, hinged at D each carrying bearings,saw-arbors, and the saws, which are usually driven by horizontal beltsfrom a counter-shaft not shown in the drawings, but located in the rearof the machine opposite the hinge D E and E are circular saws, theperiphery of which may project through slots in the table in the usualmanner.

So far as described above, the parts named are well known and have longbeen in common use; but there is danger of accident to the work or tothe operators by attempting to use one of the saws before the other islowered completely below the surface of the table.

In my device I use the sprocket-wheels a a, upon which are mounted theendless chains aw. The upper sprocket-wheels are fastened I to the shaft11 by set-screws a The wormwheel I) is also fastened to the shaft 0.,and is revolved in either direction by means of the worm c andhand-wheel d. A small milled thumb-screw 6 may be used to prevent theWorm from moving after the saw is adjusted to the required position.Projecting from the chains are the pins a and d These pins span 6: theslots through which the chain passes in the saw-arbor frames D and D,and the pin a lifts the saw E, while the pin a being on the oppositeside of the other chain, lowers the saw E. The operation is reversed byturning the hand-Wheel d in the opposite direction. The relativeposition of the pins a and a} maybe adjusted, as desired, bylooseningthe set-screws a and revolving either of the upper sprocket-wheels aand. again fast ening by the set-screws a Itwill readily be seen thatthe said pins a and a may be set in this manner, so that it will beimpossible for the operator to bring the teeth of one of the circularsaws above the surface of the table A without lowering the teeth of theother saw below the surface of the said table A, and as it is usual tohave a splitting-saw mounted on one saw-arbor, a cutting-off saw on theother, and frequently change from using one to the other that the quickand safe changing of saws attained by my device is of great importance.

F represents a guide-rest used in connection with either saw,,butusually with the o0 splitting-saw. The Working-surface of the rest isparallel with the cut made by the saws, and may be set at a verticalright angle with the table A, as it is shown in the drawings, or atdifferent vertical angles. The block f 5 and the head of the bolt f mayslide in a T- groove f which is planed in the tableA in a line parallelwith the axis of the saw-arbors.

A pair of links f with the bolts or pins f and the lugs f and f whichproject from the rest F and block f, constitute a double hinge,connecting the rest F with the block f. A

clamp f located between the pair of links f is fitted to periphery ofthe arc of the lugs f and f and grips the said lugs, making the hingerigid when the clamp is closed by means of the screw fiand forms anefficient and quicklyoperated device for securing the rest F at suchdiiferent vertical angles as may be required. A handle-nut f 9 on thebolt f enables this entire device to be fastened to the table A at anyrequired distance from the saw.

G represents the cutting-off rest, which is similar in form to adraftsmans T-square. The blade 9 is fitted to slide free in one or moregrooves g, which are planed in the table at a right angle with the axisof the saw-arbors. The rest G is pivoted to its blade 9 at g and clampedto the same by the screw g and milled nut g a curved slot g permittingthe rest G to be set at different horizontal angles.

For convenience in setting the rest G for sawing miters, cutting off aright angle, and at any fixed angle which may be frequently required, Imake use of aspring-bolt g, which slides in a chambered lug g attachedto the blade g. A spiral spring 9 impels the bolt toward the rest G inthe manner common to spring-bolts. Holes g" are drilled in the peripheryof the circular part of the rest G, and the point of the spring-bolt byentering one of these holes locks the rest accurately at the fixed angledetermined by the location of the said hole. Aknob on the outer end ofthe table, two endless chains mounted on sprocket-wheels, means,substantially such as described, for revolving the said sprocketwheels,and two pins or studs, one projecting from each of the said endlesschains in suitable places to engage with each saw-arbor frame, one at atime, for the purpose of adjusting the relative height of the saw withthe surface of the table through which the saw projects.

2. The combination of a hand-wheel, wormgear, shaft, and two or moresprocket-wheels, with two chains adapted by means of projecting pins inthe chains, and set-screws in the sprocket-Wheels to be adjusted so asto raise the pin in one chain at the same time that the like pin in theother chain is being lowered, as and for the purpose specified.

WILLIAM CAREi, W. F. PUTNAM.

